How to access parameters from an object stored in a shopping-cart vector?

Question

Hello;
I am writing some code that will be part of a website that will have the
ability to allow customers to place items into a shopping cart and then
purchase them.
The way that the shopping cart works is that a products page is displayed on the website that has 'add' buttons on it next to each product on the page.
When the customer clicks the 'add' button next to a particular product to purchase it, the code performs a query of a products database table for the numeric product id linked to the 'add' button they clicked.
When the product id is found, the query then loads the
product information for it from the DB table columns into the shopping cart
Vector as an object in the form of a result set string. This object contains
the parameters that define the product, i.e. product_id, product_quantity,
date_ordered, ship_status and so on.
In the code, when the customer is done shopping and clicks on a button
labelled 'place order', I want the code to access the shopping cart Vector
and extract each item object from the cart. I then want the code to be able
to get from each item object, the parameters that make up each item as
described above and take the values stored in each of the parameters and
store them in variables. Finally I want to take those variables and write
them to an orders DB table in the proper columns via a query.
I have tried researching information on Vectors to see if I could find out a way to do this but the little information that I located did not give me a clear idea
of how to go about writing the code, it only seemed to suggest a vague,
rough idea as to how it might be done. I am relatively new to Java
programming and so don't have any experience working with Vectors.
I have enclosed the code below that shows how the items are being stored in the shopping cart Vector. Can anybody tell me how I could go about writing the code that will extract the items from the shopping cart as described above in a servlet? Any assistance you can give me will be greatly appreciated.
Thank you!
String productID = request.getParameter("productID");
String qty = request.getParameter("qty");
Vector cartlist = new Vector();
try {
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
java.sql.Connection conn = java.sql.DriverManager.getConnection("jdbc:odbc:website", "", "");
java.sql.Statement st = conn.createStatement();
String query = "SELECT productID, productName, productCategory,
productPrice from Products WHERE productID ='" + productID + "'";
java.sql.ResultSet rs = st.executeQuery(query);
while(rs.next()){
cartlist.addElement(rs.getString("productID") + " " +
rs.getString("productName") + " " +
rs.getString("productCategory") + " " +
rs.getString("productPrice") + " " + qty);
} catch(SQLException sqlex){
} catch(Exception e){
}

Answer 1

//Try Changing your code this way.
String productID = request.getParameter("productID");
String qty = request.getParameter("qty");
Vector cartlist = new Vector();
try
     Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
     java.sql.Connection conn = java.sql.DriverManager.getConnection("jdbc:odbc:website", "", "");
     java.sql.Statement st = conn.createStatement();
     String query = "SELECT productID, productName, productCategory, productPrice from Products WHERE productID ='" + productID + "'";
     java.sql.ResultSet rs = st.executeQuery(query);
     while(rs.next())
          String productID = rs.getString("productID");
          String productName = rs.getString("productName");
          String productCategory = rs.getString("productCategory");
          String productPrice = rs.getString("productPrice");
          String productID = rs.getString("productID");
          cartlist.addElement(new AddCardElement(productID, productName, productCategory, productPrice, productID, qty));
          //class AddCardElement should be there in your application
catch(SQLException sqlex)
catch(Exception e)
//you have to add a new class AddCardElement like this
class AddCardElement
    public String m_productID;
     public String m_productName;
     public String m_productCategory;
     public String m_productPrice;
     public String m_productID;
    public GenerateLocationData(String productID, String productName, String productCategory, String productPrice, String productID, String qty)
        m_productID = productID;
          m_productName = productName;
          m_productCategory = productCategory;
          m_productPrice = productPrice;
          m_productID = productID;
}//-Achyuth B